[whyzze]

you will hit your set approx 1 in 8 times.

Therefore, if villian stacks off everytime you hit a set, then you need pot + implied odds of 8-1 to break even.

But villian will not always stack off, for instance, he has QQ, flop comes AK6.

So you must adjust, i believe the math has been done many times and it works out to something like 11/12-1 needed.

That number should increase/decrease based on reads etc.